Question 400557
|category|easy|difficult|

|music||||0.2||0.15|
|sport||||0.2||0.1|
|history||0.1||0.05|
|nature|||0.15|0.05|
____________________________

(a) i am going to take one card at random from the box.
what is the probability that it will be:

a history question? (0.10+0.05 = 0.15
an easy question?   0.65

(b) there are 40 cards in the box.
how many of these are music questions? 0.17*40 = 6.8
===============
Cheers,
Stan H.